764. The gyrfalcon, an Arctic bird of prey, has survived a close brush with extinction; its numbers are now five times greater than when the use of DDT was sharply restricted in the early 1970’s.
(A) extinction; its numbers are now five times greater than
(B) extinction; its numbers are now five times more than
(C) extinction, their numbers now fivefold what they were
(D) extinction, now with fivefold the numbers they had
(E) extinction, now with numbers five times greater than
the key:A。
为什么用"numbers"? 不是应该用"number"吗？所有选项都是"numbers"，虽然不是考点，也只是想了解一下。谢谢。
同问~~~
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